The FX-8350 is a bit better in most multi-threaded benchmarks due to the extra cores, but Intel wins hands down in single thread performance and gaming. The situation might also change when the chips are overclocked.

The Gigabyte GA-Z77-D3H is $120 by the way and will get you to 4.5GHz without any issues.

What res do you play at? Given your gpu, you have a very capable gaming rig already. Going to intel will see a frame rate improvement, but it won't be massive. I personally wouldn't value the improvement at $400 - 800.

If there is one thing you can be sure of with AMD, it's that they will never live up to expectations.

Go with Intel, overclock it and don't look back, even if you do you look back you will never be able to see AMD as it will be lagging so far behind.

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I wouldn't buy it anyway, but the AMD faithful swear that Steamroller is going to be the turn-around for AMD. They have been catching up to Intel lately, the FX-8350 is a great CPU at the price, and AMD motherboards offer more features for the price when compared to Intel.

The 8150 was a fake 8-core, the 8350 is a real 8-core, and the next one is supposed to be an 8-core with better single-threaded performance.

Is the power consumption and slight fps gains worth a $400-800 investment?

Maybe to some but I would choose to wait it out.

Another story if your just itching to upgrade, in which case I would thrown in nice SSD (if you don't already have one of course) and maybe the fx-8350 (depending on how itchy the itch) and be happy until next gen release.